Since tortoises are herbivores, feed them a mix of vegetables and fruit. About 80 percent of his diet should be fresh vegetables like dandelion greens, kale or collard greens along with green or yellow peppers, sweet potatoes, squash and cauliflower. About 20 percent or less should consist of fruit including apples, melons and grapes. Offer fruit only every third or fourth feeding. You can also add hay, both timothy and alfalfa, to their diet as well as high-fiber grasses and weeds. Try prepared foods for tortoises as well like Zilla Land Turtle & Tortoise Food.